NSI-189 vs Selank
Overview
NSI-189 is primarily a cognitive enhancement peptide, while Selank is used for sleep & recovery.
This page compares NSI-189 and Selank across their primary use, typical dosing, reported benefits and side effects, and U.S. regulatory status. For the full monograph on either compound — mechanism of action, clinical research, and references — follow the article links.
Side-by-side comparison
| NSI-189 | Selank | |
|---|---|---|
| Category | Cognitive Enhancement | Sleep & Recovery |
| Regulatory status (US) | Research use only | Research use only |
| Typical dosage | Research protocols vary | 250-500 mcg |
| Frequency | research | evening |
| Reported benefits | Hippocampal growth, potential depression treatment, cognitive enhancement | Anxiety reduction, stress relief, sleep quality improvement |
| Reported side effects | Experimental. Side effects under investigation | Very well-tolerated |
Key differences
Primary use. NSI-189 is categorised under Cognitive Enhancement, while Selank falls under Sleep & Recovery. Their differing categories mean they are usually chosen for different goals rather than as direct substitutes.
Regulatory status. NSI-189: not FDA-approved; treated as a research compound. Selank: not FDA-approved; treated as a research compound.
Dosing. NSI-189 is typically dosed at Research protocols vary (research). Selank is typically dosed at 250-500 mcg (evening).
Can you stack them?
Some protocols combine peptides, but stacking NSI-189 and Selank has not been validated for safety or efficacy in controlled trials. Combining compounds can change their effects and risks. Nothing here is medical advice — consult a qualified healthcare provider before starting or combining any protocol.
Frequently asked questions
- What is the difference between NSI-189 and Selank?
- NSI-189 is primarily a cognitive enhancement peptide, while Selank is used for sleep & recovery. NSI-189 is not FDA-approved; generally classified as a research compound, whereas Selank is not FDA-approved; generally classified as a research compound.
- What is NSI-189 used for?
- Neurogenesis, depression.
- What is Selank used for?
- Anxiolytic for sleep.
- Can you take NSI-189 and Selank together?
- Some users combine peptides within a single protocol, but stacking NSI-189 and Selank has not been established as safe or effective in controlled trials. Neither this comparison nor PeptideSciences101 is medical advice — consult a qualified healthcare provider before combining any compounds.
- Is NSI-189 or Selank FDA-approved?
- NSI-189 is not FDA-approved; generally classified as a research compound. Selank is not FDA-approved; generally classified as a research compound.